html,
body {
    min-height: 100vh;
    width: 100vw;
    overflow: hidden;
}

img {
    max-width: 100%;
}

body {
    background: #56ccf2; /* fallback for old browsers */
    background: -webkit-linear-gradient(to right, #2f80ed, #56ccf2); /* Chrome 10-25, Safari 5.1-6 */
    background: linear-gradient(to right, #2f80ed, #56ccf2); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
}

pre {
    background-color: #f2f2f2;
    padding: 15px;
    font-size: 14px;
    font-family: Consolas;
}

.board {
    position: absolute;
    z-index: 1;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    min-height: 600px;
    border-radius: 3px;
    background-color: #fff;
    padding: 20px;
    box-sizing: border-box;
    > .board-title {
        text-align: center;
        font-size: 40px;
    }
    > .board-content {
        padding: 15px 0px;

        .example-dom {
            text-align: center;
            padding-top: 50px;
            color: #888;
        }
    }
}
